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Add Etag header for manifests.

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Return 304 (Not Modified) if retrieved with If-None-Match header

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
This commit is contained in:
Richard Scothern 2015-06-18 16:56:05 -07:00
parent 92e2636de0
commit 6bedf7d1cd
2 changed files with 47 additions and 0 deletions
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29
docs/handlers/api_test.go
View file

@ -449,6 +449,7 @@ func TestManifestAPI(t *testing.T) {
checkResponse(t, "fetching uploaded manifest", resp, http.StatusOK)
checkHeaders(t, resp, http.Header{
"Docker-Content-Digest": []string{dgst.String()},
"ETag": []string{dgst.String()},
})
var fetchedManifest manifest.SignedManifest
@ -470,6 +471,7 @@ func TestManifestAPI(t *testing.T) {
checkResponse(t, "fetching uploaded manifest", resp, http.StatusOK)
checkHeaders(t, resp, http.Header{
"Docker-Content-Digest": []string{dgst.String()},
"ETag": []string{dgst.String()},
})
var fetchedManifestByDigest manifest.SignedManifest
@ -482,6 +484,33 @@ func TestManifestAPI(t *testing.T) {
t.Fatalf("manifests do not match")
}
// Get by name with etag, gives 304
etag := resp.Header.Get("Etag")
req, err := http.NewRequest("GET", manifestURL, nil)
if err != nil {
t.Fatalf("Error constructing request: %s", err)
}
req.Header.Set("If-None-Match", etag)
resp, err = http.DefaultClient.Do(req)
if err != nil {
t.Fatalf("Error constructing request: %s", err)
}
checkResponse(t, "fetching layer with etag", resp, http.StatusNotModified)
// Get by digest with etag, gives 304
req, err = http.NewRequest("GET", manifestDigestURL, nil)
if err != nil {
t.Fatalf("Error constructing request: %s", err)
}
req.Header.Set("If-None-Match", etag)
resp, err = http.DefaultClient.Do(req)
if err != nil {
t.Fatalf("Error constructing request: %s", err)
}
checkResponse(t, "fetching layer with etag", resp, http.StatusNotModified)
// Ensure that the tag is listed.
resp, err = http.Get(tagsURL)
if err != nil {

18
docs/handlers/images.go
View file

@ -60,6 +60,10 @@ func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http
if imh.Tag != "" {
sm, err = manifests.GetByTag(imh.Tag)
} else {
if etagMatch(r, imh.Digest.String()) {
w.WriteHeader(http.StatusNotModified)
return
}
sm, err = manifests.Get(imh.Digest)
}
@ -75,6 +79,10 @@ func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http
imh.Errors = append(imh.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
return
}
if etagMatch(r, dgst.String()) {
w.WriteHeader(http.StatusNotModified)
return
}
imh.Digest = dgst
}
@ -82,9 +90,19 @@ func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Header().Set("Content-Length", fmt.Sprint(len(sm.Raw)))
w.Header().Set("Docker-Content-Digest", imh.Digest.String())
w.Header().Set("Etag", imh.Digest.String())
w.Write(sm.Raw)
}
func etagMatch(r *http.Request, etag string) bool {
for _, headerVal := range r.Header["If-None-Match"] {
if headerVal == etag {
return true
}
}
return false
}
// PutImageManifest validates and stores and image in the registry.
func (imh *imageManifestHandler) PutImageManifest(w http.ResponseWriter, r *http.Request) {
ctxu.GetLogger(imh).Debug("PutImageManifest")